Q2225 Multilink OMRON units

I am trying to multilink two OMRON LK101
units on RS422. My project runs fine for one unit but I can't
communicate with the second unit.

Solution:

Remove the -s special option from the
Ports form.

Yes! I did that and then both units crashed?

OK on the LK101, LK201 and LK202 there is a switch on the bottom
of the PLC which is the hardware equivalent of the -s option. Make
sure that this switch is in the off position for multilink
operation. You will have to remove the PLC from the rack to access
this switch.